Hello Rob my name is ***** ***** I will help you.
How do you know that booking.com was aware of this?
I don't think you have to declare con cities when you book?
Correct. Its a matter of individual contracts between the Landlord and customer. There would also be Data Protection Act issues.
Its hard - all you have is the contract between you and booking.com
You need to check its terms to see what information they have to give to you. If it doesnt say they need to disclose these matters then they do not - you agreed to the contract.
I am sorry.